Arcadia Look up Arcadia at Dictionary.com
mountainous district in central Peloponnesus, a Latinized form of Greek Arkadia, which is traditionally from Arkas (genitive Arkadas), son of Zeus, name of the founder and first ruler of Arcadia.

The idealized Arcadia of later pastoral romance, "the home of piping shepherds and coy shepherdesses, where rustic simplicity and plenty satisfied the ambition of untutored hearts, and where ambition and its crimes were unknown" [John Mahaffy, "History of Classical Greek Literature," 1880] seems to have been inspired by "Arcadia," a description of shepherd life in prose and verse by Italian Renaissance poet Iacopo Sannazaro, published in 1502, which went through 60 editions in the century. It is exemplified in English by Sir Philip Sidney's poem, published in 1590, and in Spanish by Lope de Vega's, printed in 1598. Classical Arcadia, Mahaffy writes:
was only famed for the marketable valour of its hardy mountaineers, of whom the Tegeans had held their own even against the power of Sparta, and obtained an honourable place in her army. It was also noted for rude and primitive cults, of which later men praised the simplicity and homely piety--at times also, the stern gloominess, which did not shrink from the offering of human blood. ["Rambles and Studies in Greece," 1887]
Poetic Arcady is from 1580s.